SURFACE ACOUSTIC WAVE DEVICE GENERATING OUTPUT SIGNAL WITH ONLY SYMMETRICAL VIBRATION MODE ACOUSTIC WAVE OR ONLY ASYMMETRICAL VIBRATION MODE ACOUSTIC WAVE

摘要

PURPOSE: To provide a surface acoustic wave device which generates an output signal with only a symmetrical acoustic wave mode or only an asymmetrical acoustic wave mode and free from a parasitic loss ;CONSTITUTION: The device is provided with a first transducer 54 and a second transducer 56 arranged with an interval in a horizontal direction. The device is driven by both of the first transducer 54 and the second transducer 56. A third transducer 78 is arranged between the two first transducers 54 and elastically coupled with them. All electrodes of the three transducers are mutually arranged in a piezoelectric substrate so as to generate only a symmetrical acoustic wave vibration mode or only an asymmetrical acoustic wave vibration mode.;COPYRIGHT: (C)1994,JPO